Crossfire is graphical multi-user 2d tile-based role playing game similar to Moria, Angband, Omega, Nethack, Rogue, Gauntlet, and Muds. The bulk of the game is based on predefined maps, however some areas are randomly generated.

Colossus is a Java clone of the boardgame Titan, a turn-based fantasy wargame for 2-6 players. Each player moves stacks of creatures around a strategic board, recruiting more creatures and fighting enemy stacks on tactical maps.

An alternative/custom Minecraft server, written in Java, compatible with the original protocol. OpenCraft is built upon Apache MINA, SLF4J, Jython and XStream. The aim is to have features not in the official server distribution, like antigrief/scripting.

The fortbattle player replays a fortbattle of the browser game "The West" (http://www.the-west.net). It displays the battle like the ingame flash player, but you can control the speed, skip rounds and see some statistics. Ingame use req. GreaseMonk

Develop an experimental framework for simulated multiplayer (model) railroads.
It could be based on the VRML/X3D standard and it could use internal scripting with ECMAScript and MU systems that provide network sensor interfaces.
Project Homepage: http://simulrr.sourceforge.net